Sheet shaping and bending machine.



J. F. HOAG & W. THOMAS.

SHEET SHAPING AND BENDING MAUHINE.

APPLIOATION IILED 001224, 1911. Patented Oct. 15, 1912.

7 SHEETS-SHEET 1.

INVENTORS WITNESSES:

Attorney,

J. F. HOAG & W. THOMAS.

SHEET SHAPING AND BENDING MACHINE.

APBLICATION FILED 00124, 1911.

1,041,471 v Patented 0011.15.1'912.

7 SHEETS-SHEET 2.

W JTNESSES J. F. HOAG & W. THOMAS.

SHEET SHAPING AND BENDING MACHINE.

APPLICATION FILED OCT. 24, 1911.

1,041,471. Patented Oct. 15, 1912.

7 SHEETS-SHEBT 4.

I n I11 m @1 @2 E I I k 5;:

i It .7 1/0 J. I ,3 38 I 38 t I. 1 i :1 1 5 I I I 37 i ii I P1 I I 1 :i i -9) i :l

" WI NESSES. 3 6 VENTORS i 57?, By Ff 11454. 1

J. P. HOAG & W. THOMAS. SHEET SHAPING AND BENDING MACHINE.

Patented Oct. 15, 1 912.

7 SHEETS-SHEET 5.

APPLIGATIOIT IILED OCT. 24, 1911.

J. P. HOAG & W. THOMAS.

SHEET SHAPING AND BENDING MACHINE.

APPLICATION FILED OCT. 24, 1911.

1,041,471, Patented 0ct.15,1912.

7 SHBETS-SHEET 6.

WWLWWM J. F. HOAG & W. THOMAS.

SHEET SHAPING AND BBNDING MACHINE.

APPL-IGATION FILED 00'1. 24, 1911.

Patented Oct. 15, 1912.

7 SHEETS-SHEET 7.

I/73n/esses:- 7

UNITED STATES PATENT PGFEEQE.

JOHN F. HOAG AND WILLIAM THOMAS, OF BEATRICE, NEBRASKA, ASSIGNORS TO DEMPSTER MILL MANUFACTURING COMPANY, OF BEATRICE, NEBRASKA, A COR- PORATION OF NEBRASKA.

SHEET SHAPING AND BENDING MACHINE.

Specification of Letters Patent.

Patented Oct. 15, 19121.

Application filed October 24, 1911. Serial No. 656,421.

To all who-m 2'25 may concern Be. it known that we, JOHN F. Hone and WILLIAM THOMAS, citizens of the United States, residing at Beatrice, in the county of Gage and State of Nebraska, have invented certain new and useful Improvements .in andRelating to Sheet Shaping and Bending Machines, of which the following is a specification.

This invention relates to certain improvements in machines for corrugating or otherwise bending and shaping metal sheets; and the objects and nature of the invention will be readily understood by those skilled in the art in the light of the following explanation of the accompanying drawings illustrating what Wenow consider to be our preferred embodiment from among other torn at-i'ons and arrangements within the spirit and scope of the invention.

An object of the invention is to provide improved .mechanism for simultaneously rolling the opposite longitudinal portions of metal sheets to corrugate or otherwise shape said portions thereof, and to provide adjusting means whereby said mechanism can be adapted to sheets of different widths.

A further object of the invention is to provide an improved sheet metal rolling machine for longitudinally corrugating or otherwise shaping metal sheets, capable of quick and easy adjustment for the production of such sheets fiat throughout their lengths, or curved throughout their lengths, or partially fiatand partially curved.

A. furtherobject of the invention is to provide a machine for longitudinally corrugating or otherwise shaping sheet metal,

readily adjustable to operate on sheets ofdiiie'rentwidths, and also adjustable while in action to longitudinally curve or bend a sheet wholly or partially into rounded or circular form, or to produce the corrugated or otherwise shaped sheet in flat form.

A further object of the invention is to provide a machine to receive flat metal sheets throughout one longitudinal edge formed into a stiffening roll or tube, and to longitudinally curve such sheets into circular form throughout, or only partially throughout the length thereof, and to provide such machine with guiding thrust receiving means for the reception of s uh rolled or tubular edges.

A further object of the invention is to provide a machine for receiving flat metal sheets, each at one longitudinal edge formed into a stiffening roll or tube and at the opposite longitudinal edge doubled into a. seam forming hook, and t0 longitudinally roll side and rounded end tanks.

A further ob ect of the invention is to provide certain improvements in adjustments, and in arrangements and combinations of parts whereby a highly efficient machine will be produced for economically rolling and shaping metal sheets.

The invention consists in certain novel features in construction and in cozxbina'tions and arrangements of )arts and elements as more fully and particularly set forth hereinafter.

Referringto the accompanying drawings Figure 1, is a side elevation of a machine embodyiig the features of our invention, the view being taken from the inlet or sheetreceiving side of the machine, various parts being indicated by dotted lines. Fig. 2, is a rear elevation, dotted lines indicating the path of the sheets through the machine when straight shaped sheets are being produced thereby. Fig. 3, is a bottom plan view of the machine, parts being broken away. Fig. 4, is a vertical sectional view of the lower portion of the machine, taken in a plane parallel with the path of the sheets through the machine, the lower right hand shaping roll and the lower sheet curving or bending roll appearing in side elevatimi. Fig. 5, is a vertical sectional. view of the upper portion of the machine taken in the plane of the lines 55, Fig. 6. Fig. (3, is a horizontal section taken in the plane of the line 66, Fig. 1. Fig. T, is a detail the rorrcspomli11g positions of the bending n1. curving rolls. Fig. 8, is a horizontal section tak n in the plane or the line 8-S, l, a slant being shown passing through themachinc in straight form. Fig. 9, is a detail vertical'section taken in the plane of the'line 9-9, Fig. 8. Fig. 10, is a detail plan of the index disk, certain cooperating partsbeing shown in cross section. 'Fig'. 11, is a detail elevationof the upper cooperating shaping or corrugating rolls. Fig, 11, is a detail elevation of the lower cotiperating shaping or corrugating rolls. F ig- 12, is a sectional perspective viewofa straight sheet as'prepared in readiness for passing'through themachine of-o'ur invention. Fig. 13, is a sectional perspective of the sheet after it hasbeen passed through and shaped by the machine. .Fig. 14, is a sectional perspective of a portion of a tank into which the sheet of Fig. 13, has been incorporated to'form the vertical or surrounding tank-wall, Fig. 15, is a'perspective viewof the working or operative parts of the machine, the frame work and certain supporting parts not being shown.

In the drawings, we show a strong rigid upright main framecomprising two parallel spaced side pieces 1, suitably fixed together. i

2, 'is ashorizontal shaft mounted in suitable'boxes on the upper end-of the main frame and provided with fast and loose pulleys for the reception of a driving belt. 3, is a vertical rotary shaft extending approximately throughout the height of the main frame and arranged at the rear portion thereof and mounted in suitable boxes carried thereby. Shaft 3, is geared to and driven by the horizontal shaft 2, through the medium of bevel gearing 4. At its lower i 9, is bodily adjustable in a vertical plane in- .1 metal sheets movein passing between the end, this vertical drive shaft carries'a pinion 5, fixed thereto and meshing with and driving gear 6, on the lower-projecting end of one of the roll shafts; At the receiving side of--the machine, two vertical parallel roll shafts 7, 8, are arranged, and in rear thereof (in the direction of movement of the sheets through the machine) is arranged another vertical roll shaft 9. The right hand roll shaft 8, has the driving gear 6,

'fixed to its projecting lower end, and the l'efthand roll shaft 7 is geared to and positively rotated with the shaft 8, throughthe medium ofmeshin gears 10, on the lower end portions of said two shafts. p As fully explained hereinafter, the shaft tersectingthe vertical plane, in Whichthe shafts 7 and 8,. and a's it is desirable to positively rotate shaft 9, whatever-fits position, an expansion gearconnectionis provided between shafts 8 and 9,"'wh ereby shaft 9, will constantly rotate wit-h and in the same direction as shaft 8. This expansion gear connection is arranged to the right,'and out of the way, of the path of movement of the work, metal sheets, between roll shafts 7, 8,

and is located intermediate the lengths of said shafts, usually betweenthe upper and lower sets of rolls driven by said shafts and hereinafter explained. In the specific. example illustrated, a. this expansion driving connection comprises a gear 11., fixed on shaft 8, and in mesh with and driving an intermediate gear 12, on short vertical idler shaft 13, and a gear 14, fixed on shaft 9, and in mesh with and driven by gear 12, and hence constantly rotating shaft 9, with and in the same direction as shaft 8. The idler shaft 13, and the intermediate gear 12, are supported by, and the gear 12, is held in constant operative mesh with,'gears 11, 14, by two pairs of horizontal swingable links 15, overlappin and pivotally joined at their free ends by' the shaft 13. The gear 12, is arranged between the overlapping ends of said links. The links of .one pair are arranged above and below. the gear 11, and have end boxes surroundingand loosely receiving the shaft 8, while the gear 14, is arranged between the links'of the other pair which have end boxes loosely receiving the shaft 9. lVithout further explanation,- it will be obvious to those skilled in the art, that the shaft 9, can be adjusted in the-path I described and yet the links will maintain the operative dr1v1ng connection from shaft 8,

in its range of adjustment.

Horizontally disposed housings or frames to shaft 9,- whatever the position of shaft 9,

16, project forwardly from the upper and lower portions of the frames 1, and are rigidly fixed thereto and form portions of the main frame work of the machine. These 7 housings are formed with horizontally elon- I gated slots or Ways 17 receiving the' upper and lower boxes 18, in which the shafts 7 and 8, are journaled. Said housings are also formed with the elongated slots or ways 19,

parallel with slots 17 and in which the upper and lowerboxes 20, of the shaft 9, are confined. Eachhousing can be formed with one slot 17, receiving corresponding boxes 18, of shafts 7 and 8, and the boxes ofeach pair can be yieldingly held apart by interposed spring 21, while set screw 22, having hand wheel 23, can beprovided to adjust said boxes. and the shafts thereof toward each other to control the pressure of the rolls of said shafts onthe work. I The boxes 20,

of shaft 9, are longitudinallyadjustable in slots 19, and are yieldinglyheld toward the inner ends o'f'the slots by coded-springs 24.

The outer ends ofthe said various slots or ways of the housings can be closed byfront plates or bars 25, rigidly secured to, the front edges of the housings and CalljVinQit-hfl pressure adjustingscrews 22, and forming abutments for springs 24. The upper ends of l the shafts projecting above the upper boxes 18, 20, can be provided with stop collars 26,

resting onsaid boxes. I The shafts? and 8,

' This are provided with cooperating opposing metal corrug'ating (or otherwise shaping) and feeding rolls 27, and. 28, fixed to said shafts, respectively, and usually arranged at the lower portions of the shafts and above the lower housing 16. The circumferential cooperating working port-ions of these rolls can be of any desirable contour or formation accordingto the work to be done or the shape to be imparted to the sheet metal passed between the rolls. For instance, in the example illustrated, the rolls are designed to longitudinally corrugate metal sheets carried forward by these positively driven rolls, and to form these longitudinal corrugations at a fixed and uniform distance from the adjacent'longitudinal edge portions of the sheets so that the corrugations will be throughout their lengths parallel with the adjacent longitudinal edges of the sheets.

Means can also be provided in advance ofthe bite of the rolls 27, 28, to guide the sheets thereto and maintain the same in proper position with respect to said rolls. For

instance, we show sheet supporting and guiding vertical idler wheel, pulley or roll 29, carried by a horizontal idler shaft mounted in bracket 30, fixed to and rising from the side edge of the lower housing 16. guide wheel is circumferentially grooved to receive the lower longitudinal edge of the flat sheet in advance of rolls 27.

28. An angularly arranged circumferentially grooved thrust-receiving and guiding idler wheel, roll or pulley 31, is arranged in advance of the roll 28, and to the right of the path of movement of the sheets as they enter bet-ween rolls 27, 28, and this wheel 31, is carried by a vertically disposed laterallyinclined idler shaft mounted in vertically disposed bracket 32, fixed to and projecting forwardly from one of the frame sides 1. This inclined wheel is designed to overlap the lower upturned or enlarged edge portion of the sheet as it advances to the corrugating rolls and hold the same down to wheel 29, and sustain the lateral thrust of said sheet. These guide wheels not only hold the sheet against vertical movement from the desired horizontal plane, but maintainthe lower portion of the sheet, in advancing to.

the corrugating rolls, from lateral deflection from the desired vertical plane. The lower portion of the rear roll shaft 9, is providedwith a sheet bending or curving roll 33, fixed to and rotating with said shaft.-

This roll 00, is arranged behind roll 28, and is parallel therewith, and is adapted to be adjusted from right to left and from left to right, into and from the straight path of movement of the sheets passing from be,- tween the corrugatmg rolls 27, 28, to engage the lower portions of the sheets as they leave the corrugating rolls and aid in the producsheet beyond 'the-corrugating rolls. The

sheet corrugating and bending or curving rolls thus far described are designed to acton one longitudinal portion of the sheet, the lower portion in the example illustrated, and they are usually fixed against vertical adjustment, and hence we provide a corresponding set of rolls for operating on the opposite longitudinal portion of the sheet and render this set of rolls adjustable to ward and from said first named set of rolls to accommodate sheets of different widths.

These upper rolls are rotated by the shafts 7, .8, and 9, and are adjustable longitudinally thereof. For instance, the shafts 7, 8, 9, beginning at points above the rolls 27, 28, 33, and terminating below the upper boxes 18, 20, are provided with longitudinal feather keys 34, and upper rolls 35, 36, 37, are longitudinally adjustable on their respective shaftsbut are held to rotate therewith by said keys, although of course we do not Wish to limit our invention to this specific construction.-

The rolls 35, 36 are on the shafts 7, 8, respectively, and cooperate to feed, press and shape the upper longitudinal portions of the sheets to the desired conformation, and hence the contours of these rolls will be provided according to the work to be produced thereby, although in the specific example illustrated, these rolls are designed to corrugate the upper portions of the sheet and to bend or curve the upper edge portion of the sheet laterally above the corrugation. The right hand and lateral thrust receiving roll 36, is preferably provided with a circumferential horizontally projecting flange or lip 36, designed to overhang thetop edges of the sheets and receive the upward thrust (if any) of the sheets, and the left hand roll 35, can be correspondingly reduced circumferentially to receive this flange 36.

The upper sheet bending or curving roll 37 can. be of any suitable surface contour, usually generally conforming to that of the portions of the sheets to be engaged thereby, and this rollcotiperates with the lower roll 33, in bending or curving the sheets laterally.

Various means can be provided for simultaneously adjusting the set of rolls 35, 3b,

37, toward and from the opopsite set of rolls and maintaining the same in the desired ad- 50 a vision'of the spring-43, carrying said gang and the fact that the screw 41, is freely I justment. As highly advantageous means -vertically therewith.

. recesses 39, in the yoke, one. for each roll, 2

yoke is raised and lowered by a non-rotary position by a rotary nut having hand wheel lower end thereof and the top face of'said v of uniformwidththroughout their lengths,

' mit automatic vertical adjustment thereof v The upper gang of rolls follows the top lon- I that the adjustable gang of rollsican .be

I arranged in front of the rollshaft 8, and the" vantage. is attained by so mounting the date sheets of d'ifierent widths within the andform the extended upper ends of the rolls with circumferential grooves or depressions 40, loosely receiving the yoke so that the upper ends of said rolls overhangthe yoke and rest and turn on the top face thereof.

The rolls enter the slots of the'yoke and the f grooves-of the rolls receive the edge walls of the slots. The slots permit the lateral adjustment of the roll shafts and rolls. This vertical screw 41, freely movable vertically through the top housing 16, and at its lower end fixed in or to the yoke to support and move the same. The screwis raised and lowered and held in .the desired vertical 42, all arranged above said top' housing. We preferably mount'the nut ona heavy coiled spring 43, interposed between the housing for the purpose of yieldingly supporting the upper set of yokes.

It is well known to those skilled in the art that steel or metal sheets are not always that the longitudinal edges thereof are notalways parallel, and hence an important adu'pp'er' or adjustable gang of rolls as to perto accommodate variations in the widthof each sheet, or departures of the top edge of the sheet from a straight horizontal 11118.

gitudinal edge of each sheet and where variations occur the gang ,of rolls can slightly and automatically rise or fall in following vsaid edge because of the .pro-

movable vertically through the top housing. j g, It is obvious to tl 'wse skilled inthe art,

aised 'or lowered by rotating the hand wheel 2, in the proper direction, to accommo capacity of a particular machine.

A vertlcally elongated idler roll 44, is

upper corrugating roll 36, and parallel therewith',' and to the right of'the path of movement of the sheets into the x nachine.

r meshing bevel gears 51.

At its upper end this roll can be mounted in a bracket 45, fixed to the upper housing 16, and at its lower end in the upper portion of the bracket 32. The'lower end of thisidler 44, terminates a distance above the angularly arranged guide wheel The. sheets enter the machine to the left of this idler and bear against the surface thereof and are guided thereby. Thepartioular, purposeof this idler rollis toreceive the lateral thrust of the sheets during the rolling orcurving action of the rolls 33, 37, and

it will be noted that this idler bears against each sheet approximately throughout the full vertical or transverse. width thereof and across the intermediate portion thereof between the opposite edge portions being operate'd on byv the two pairs of shaping or corrugating rolls. The two rear curving or bending rolls, when inaction, deflect or bend each sheet toward the left,

and-hence tend to deflect the] portion of I the .shel'it in front of and advancing to the corrugating rolls toward the right, but

' this idler 44, receives this thrust toward the right and keeps the rear portion of the ,7

sheet flat and straight. v I Various devices can be provided for simultaneously and uniformly shifting or ad justing the positions of the bending or curv- .95

ing rolls 33, 3'7, with respectto the straight path of the sheets emerging from the shaping or corrugating rolls, to carry said bending rolls to and from bending'p'osition and to various bending positions .to roll the sheets to the curve of the desired. radius.

As an advantageous structure and arrangement for this purpose, we show'a pair of horizontally disposed push rods 46, extending forwardly through holes in thehous- ,105

ings 16, and reciprocator'y therein. At their forward ends these push rods abut against the rear ends of the boxes 20, respectively, of the shaft 9. The springs 24, hold these boxes to the push rods. The push rods projeotv beyond the rear ends of.the housings and are held by said springs in engagement with theouter spiral edges of similar uniformly arranged volute cams 47, fixed on vertical cam shaft48, arranged at the rear of the main frame and mounted in suitableboxes carried thereby. Any suitable. means can be provided for rotating this shaft 'to. attain the desiredoposition of the; cams with respect tothe pu'sh rods. For instance, we

show. a manually-operated horizontalshaftg 49, arranged at the rear ofthe main frame in suitable boxes and having handle 50, and operatively connectedto the camshaft for" rotating the same throu gh the medium of The curved work ngedges of the two carns are simllar 1n -,forma t1onand arrangement with respect to as shaft 48, andltherpushl rods so asto simultaneously and uniformly operate the two push rods. The working edge of each cam is of a continuous gradually increasing curve from the lowest end to the highest end thereof, forming an abrupt shoulder between the ends of the edge, and the push rods are arranged radially of the cam shaft with their ends abutting said cam edges. The arrz-ingement is such that when the cams have been rotated to their limit of movement in one direction said abrupt shoulder will laterally engage the push rods and the ends of the rods will bear against the lowest portions of the cam edges and the rods will be at their limits of rearward movement and the roll shaft 9, will be at its limit of movement toward the right and the sheet curving rolls 33, 37, will be out of operative sheet curving position permitting the corrugated shaped metal sheets to issue from the shaping rolls and from the machine in a direct straight line, for the production of flat sheets or sheets fiat throughout portions of their length.

Now if it is desired to move the curving rolls toward the left and to sheet bending or curving position, the cam shaft is 1'0-.

tated in the proper direction to cause the curved cam edges of gradually increasing radii to abut and bear against the push rods and thereby force said rods toward the left and push the shaft boxes in the same direction against the tension of springs 24. This ope-ration is continued until the sheet'bencb ing and curving rolls are brought to the properposition forcurving the sheets to the desired radius. When the cams have been rotated to bring the cam edge ends of greatest radius into engagen'ient with the push rods, the sheet curving rolls will be at their limits of movement toward the left to curve'the sheets to the smallest radius possible by the particular machine.

it will he hated that the adjustment is such as to permit the formation of shaped or corrugated flat or, straight sheets and of sheets having a curvature of any possible radius between a straight line and the shortest radius within the capacity of the particular machine, and that these adjustments can be made While the machine is in operation. In fact, the adjustment of the curving rolls can be made while the machine is acting on a sheet, to produce a sheet fiat or stra g it throughout a portion of its length and of any. desired degree or degrees of eru'vature throughout the remainder of its length.

It is desirable to provide a visible index for the bending or curving roll adjustment to visually indicate the particular sheet curvature that will be produced by any and every possible adjustment or position of said rolls, together with stop mechanism that can be set by side index to stop the bending rolls in the necessary position to produce the desired sheet curvature. As advantageous means for th1s purpose, we show an index disk 52, fixed on and rotating with the cam shaft. Around its peripheral portion, this disk is formed with visible uniformly spaced vertical perforations or sockets, 53, to removably receive a pin 54.

55, is a fixed stop secured to any suitable portion of the frame work and depending over the disk and extending into the path of the pin 54. The disk is formed .or provided with suitable indicating marks or characters adjacent to each socket 53, indicating the character of sheet (flat or radius of curvature) that will be produced by the machine when the parts are adjusted to bring the particular socket opposite the stop 55, which serves as an index or pointer. In operating the device, the pin 54, is placed in the socket indicating the particular character of sheet desired and when it is desired to have the machine start producing such work, the cam shaft is rotated in the proper direction by handle 50, until the pin 54, engages the stop 55, the bending rolls will then be in the necessary position to producethe work of the required curvature.

A sheet can be started into the machine, with the bending rolls set to curve the sheet to a certain degree of curvature, and when about the desired length of the sheet hasbeen thus curved, and while the machine is still operating on the sheet, the handle 50, can be rapidly turned to withdraw the bending rolls from operative position, so that the remainder of the length of the sheet will issue from the niachine straight or flat, or so that a portion of the remainder of the length of the sheet will be formed straight and flat, and before the entire sheet issues from the machine, the handle can. be turned in the opposite direction to quickly throw the bending rolls back to operating position to bend and curve the remaining length of the sheet to the desired radius.

It will of course be understood that the sheet can be started into the machine with the bending rolls set to produce a straight.

length, and then said rolls can be quickly thrown to bending position to bend and curve a portion of the sheet. This matter of shifting the position of the bending rolls while the machine is acting on asheet, is of peculiar advantage and utility in rolling sheets to form the vertical walls of tanks and the like, having rounded ends and straight or flat sides. The adjustable bending rolls are-also of peculiar utility and advantage in bending sheets to form the vertical walls of round tanks or the like, and where such sheets are to be formed, the bending rolls are first set to curve the sheets according to the diameter of the tanks to be produced.

Sheet metal tanks and the like are manufacturedin great variety to depth,'shape,

widthfanddiameter, and hence th'e utility 29, '31, are grooved-to receive the tubular of the presentinventionwill be apparent to edge I), of the sheeh and thewheehiglanot those skilled inthe art in view of itsfwide only receives,.the,.lateral thrust .o fisaid tu- 1 range of adjustment to receive sheets of, bular edgebut also overhangs,thegsaniqto 70 different widths and to produce sheets of hold saidedgedowntowheel29 and guide .any degree of curvature between straight the same into zt hecornugating {rolls- 1: sheets and those' of a very shortradius curvar The corrugating rolls 27, 28 aIQtC -IQumture, as wellas flat sheets and she'ets par ferentiallygrooved at bf,above-their lower m tially flat and partially curved. F urtherends, to receive stiidlubrflar edge 1);: 754

more, the machine generally as dis closed, prevent d sto tion thereof,.and to hold the i will not 'onlyp'roduce flat or curved sheets. sheets by sai tubular edges against :vertical but .willsimultaneously and by the one opmovement. If so desired, said portionsb', eration, corrugate or otherwise shape the. of the rolls can serve to eompletelycloseweopposite longitudinal edges of the sheets for duce. or otherwise finally'shape the head or 80 the production'ot tanksand other work of rolled edge 6, of the sheet. The \,'er,tical I superior strength and durability. grooved idler 29, is usually arranged between Material advantages ,are attained by the the reduced lower ends ot' t he rolls 2T"2S,wto use of a machine capable of corrugating or' receive the lower rolledor beaded edge b of otherwise shaping and curving or bending the sheet and support and-guide thesam-e 85 flat sheets that have been previously finished into the roll grooves bf. These tubular edges at their opposite edges and by other means, are thus utilized to constitute means whereto' serve as tank walls. For instance, where by the rolls can positively grip andvhold the it is desired to produce the vertical walls of lower edges of thebsheets against being tanks having pipe-inclosing tubular top drawn upwardly by the corrugatingaction 90 edges, or even the tubular edges without the of the rolls and to require the formation of stiffening pipes, and with lower edges the longitudinal corrugations at afixed unidoubled back to receive the tank bottoms form distance from and throughout parallel and to be united thereto by pressed or rolled with said tubular edges. r M I interlocking seams, it is advantageous tobe The upper corrugating; rolls 35,536, are 95 able to take the flat sheets and by suitable formed at the upper: partsoftheir working means bend or roll the edges thereof to form portions, to provide a recess. or space-to ac the stiffening tubular edge with or without commodate and permit the passage. of the? 1 the inclosed stiii pipes, and by appropriate doubled back edge a, withoutdistortion or machinery to bend the opposite longitudinal compression, and yet these rolls are so portions of the-sheets to form the hook-like formed that said recess or space is closed at doubled edges and to then be able to corruthe top to receivethe upward thrust of the gate or otherwise shape said flat partially sheet edge and hold'the same against mov prepared sheets and bend or curve the same ing up from the desired path of movement.-

40 into finalformfor assemblingwith the bot- For instance, this space for the passageof 105 toms to form the complete tanks. In Fig. 12, sheet edge 0, can be provided for-by a cirof the drawings, we show such partially cumferential depression c in roll-35, and by prepared flat sheet a, at its upper end bent the overhanging circumferential portion36'-,- or rolled into a longitudinal tube 7), inclos of roll 36. I

ing a stiiiening body or pipe and at its lower The arrangement of the corrugatiug and 11g edge doubled back and upwardly into hook shaping rolls 27, 28, and'35, 36 in connection form 0, to receive the correspondingly down with the thrust sustaining devices, is such turned edge of the tank bottom (Z, for the that the bending rolls 33, 37,'ean properly formation of a rolled or pressed seam to 'concurve the sheets and their tubular and donstitute the tight joint in the completed tank bled edges without injury thereto'or undue (Fig. 14) between the bottom and. Vertical distortion thereof.

wall. The present machine will take these It is obvioushowever, that the machine is ,tlat partially-prepared sheets a, and finish adapted for work otherthan the formation them to the form shown in Fig. 13, applying of the particular tank wall sheets disclosed 55 the stiffening corrugations c, tojthe upper Of course, it will be understood,-' 'tl1at and lower longitudinal portions thereof,and either setof rolls 35, 36 or 27 eaten bejs o forming, the lower longitudinal edge porshaped 'as:not to form"corrugationsle, in; the tionsof the sheets with the wide outward, sheets passed therethrough. For instance? downward'and inward curves-or bends f, to we 'might-fiud it desirable to rep e he etsi. 60 enable, the tank bottoms to be applied and without the corrugationsfe, nar1th locked thereto by the formation of tight edge e, or withouttheeorrugat'io rolled or pressed seams g, and to provide an the lateral curve f. v

otherwise advantageous tankstructure. The For the purposes of explaiiationtwe have. artially prepared fiat,sheets a, are fed to with particularity described'i/arious de 5 the machine of the pt'esent invention in a tails of structure but we do not wish thereby 13o to limit our invention to such specific arrangements and details. I

It is also evident that various changes, variations, and modifications might be resorted to, that elements might be omitted and features-added, without departing from the spirit and scope of our invention, and hence we do not wish to limit ourselves to the exact disclosures hereof.

Desiring to protect our invention in the path of the sheet from said feed rolls, said. feed rolls being recessed," to receive previously-formed enlarged longitudinal edges of the sheets and to thereby hold said sheets against edgewise movement in one direction, and guide meansreceiving lateral and edgewise thrust of the sheets and maintaining them against edgewise movement and to travel in a straight path through said feed rolls.

2. In a sheet metal bending machine, in combination, cobperating positively-driven sheet feed rolls, a sheet bending roll in rear thereof and adjustable across the straight path vof movement of the sheets from said feed rolls, means to prevent edgewise' movement of-the sheet longitudinally of said rolls and to maintain a longitudinal edge of each sheet while passing through said rolls in fixed relation with respect to the axes thereof, and means to maintain the sheet traveling in a straight path while passing forward between said feed rolls.

3. In a sheet metal bending machine, in combination, a pair of vertical cotiperating positively driven sheet feed rolls, sheet bending means in rear'thereof, a sheet guiding grooved idler roll arranged at the lower ends of said feed rolls and receiving the lower edges of the sheets, and cans cooperating with said grooved roll in guiding the sheets and receiving lateral and edge thrust thereof and maintaining the sheets to travel in a straight path to and between said feed rolls. I

4. In a sheet bending machine, in combination, vertical cooperating positively-. driven sheet feed rolls, sheet bending means in rear thereof, and means to receive edgewise and lateral thrust of the sheets passing between said rolls and to maintain the sheets to travel ina straight line to and between said rolls comprising-a horizontal grooved idler roll at the lfower ends of said feed rolls and receiving the lower edges of and upholding the sheets, and an inclined vertically disposed grooved idler roll in advance of and above said horizontal roll and arranged to one side of the path of the sheets to said feed rolls and cooperating with the lower edges .of said sheets.

5. Cooperating vertical positively driven rotary sheet feeding rolls having an annular recess and a coiiperatmg annular enlargement and overhang forming a recess to receive an enlarged longitudinal edge of the sheet and prevent upward shifting of the sheet longitudinally of the rolls and transversely of its direction of movementthrough the rolls, in combination with a vertical positively driven rotary sheet, bending roll adjustable to and from operative sheet curving position with respect to said rolls, and means independent of said rolls to sustain and guide the lower longitudinal edge of the sheet.

6. Coiiperating positively driven rotary sheet feeding rolls, in combination with a rotary sheet bending roll, manually-operated mechanism for shifting said roll to and from operative sheet curving position with respect to said rolls during the sheet feedmg and bending operation, and an index and stop device for said incchanlsm and movable therewith and comprising an abutment. in fixed relation with respect to said mechanism, and an index movable with said mechanism and having a manually adjust able stop to coiiperate with said abutment in stopping the action of said mechanism when said bending roll has been movedposition predetermined by thereby to the the location of said stop. a

-7. Sheetfeeding means. in combination with a rotary sheet bending roll adjustable with respect to said means to curve the sheets passing from said means to any desired radius'within the range of adjustment of said roll, a rotary cam acting on said roll ,todetermine the position thereof, said rol]. being moved throughout its full range of adjustment on each complete-revolution of said cam, said cam forcing the roll in one direction, spring means forcing the roll in the opposite direction, and manually-operated means for rotating said cam.

8. Coiiperating rotary sheet feeding rolls having parallel axes, in combination with a sheet bending ro'll arranged in rear thereof and having its axis parallel therewith, and manually controlled mechanism for ad'- justing said roll to and from sheet curving position with respect to said rolls while maintaining the same parallel therewith, said roll being adjustable independently of and without disturbing the position and operation ofsaid rolls. said mecl'lanisni comprising a rotary volute cam of uniformly increasing curvature from its lowest point I to its highest point, and a push rod provided with a spring device holding the rod to said cam, said camon each complete revolutlon ad ustmg said roll throughout its complete range of movement and capable of produced, and manually operatedmechanism for adjusting'said means comprising a r0- tary cam controlling the posit-ion of said meansand on each complete revolution capable of moving said means throughout its full range of adjustment, and a stop mechanism comprising an index corresponding to and rotating with the cam and provided with an adjustable stop and a cooperating abutment fixed with relation to the index.

10. Straight sheet feeding means, in combination wlth a sheet bending roll adapted to cotiperate with said means to curve the sheetsto any desired radius Within the range of'adjustment, and means whereby said roll can bebrought to various positions intersectin'g the normal straight path of movement otthe sheets for producing curved sheets of the desired radius, and whereby said roll can be removed from said path 'for'the' production of fiat sheets, said last mentioned means comprising a rotary member controlling the position of said roll and on each complete revolution moving the roll throughout itsfull range of adjustment and provided with an-index rotatlng therewith and having a stop adjustable to any point within its circle of rotation, and a relatively fixed abutment to cooperate with said stop.

11. Means for feeding sheets in a straight path, in combination with a sheet bendlng roll, a shaftcarrying the same, adjustable means carrying said shaft'and whereby the same can be movedin a plane intersectingsaid straight path to carry said roll to and from sald path, and manually controlled actuating mechanism for said adjustable means to \Slllfll the same to carry said roll'to' the desired position comprising a rotary volute' cam, and an index and stop mechanism comprising an index rotating with said cam and a stop adjustable thereon to any point within its circle of revolution, and a relatively fixed abutmentto c otip'erate with said stop.

12.'In combination, in a sheetbending I machine, an upright frame, a pair'of'lower coiiperatmg positively-driven vertical sheet feed -rolls,"a vert1cal POSIIfiVQlY dIlVGD ad-,

justa'ble sheet bending roll in rear of said feed'rolls, said three rolls bein g maintainedagainst" longitudinal movement, a pair of vertical cotiperatmg positively-driven upper sheet feed rolls, a vertical positivelydriven upper adjustablesheet bending roll" in rear'of said upper feed rolls, means whereby said three upper rolls are ver-f tically adjustable, said upper and lower sets ofrolls adapted to receive and act'on the opposite" longitudinal edge I portions of sheets, and r'neansto maintain the sheets to travel in a straight line to and between the 7 feed rolls andagainst 'vertical edg' e'wisei movement and for maintaining the longi Ltudinal edges of the sheets in fixed relation wit-h'respect to the axes of said feed rolls,

said means comprising thrust sustaining.

guide rolls in advance'of'said feed rolls. H

13. In combination, in a sheet bending machine,anupright'frame, a pair of ver; tical lower sheet feed rolls,*a n" adjustable sheet bending roll in'rea'r' thereoha p of vertical upper sheet feed rolls, an d ust-'1 able sheet bending rollinrear-thereof, one of said sets ofthreerolls beingvertically adjusted with respect to the other set of three rolls, means whereby said adjustable rolls are adjusted together as agang, a vertical idler roll carried by said frame in ad- Vance of said feed rolls to' receive the lateral thrust of the sheets passingbetween said rolls and to imaintainsai'dsheets .to,; travel in a straight line whilepassingi be tween said feed rolls ,"and means to prevent vertical edgewise movement of 'thesheets while passing to and between said feed, rolls comprising an idlerroll injadvance of the 7 feed rolls and receiving the H edges 'of the sheets.

bination, means to feed 'forward and shape the longitudinal'edge portions of sheet'sand a a r .100 14. In a sheet bending machine, incom-g to bend said shetslongitudinally, embody-N ing opposite sets of" rolls to; act. on? the,lon

gitudinal edge portions only of each; sheet, said sets of rollslbeing s aced a-"distance," apart and the rolls thereo having common, axes, each set of rolls comprising cotiperating positivelydriven feed rolls and a sheet bending elementadjustable across the, a straight path of movement of the sheets through the feed rolls, means whereby one setof rolls isadjustable as a gang,-toward;A

and from the other set ofrolls, to accommo-i datesheets of different'fwidth, andsheetlem. 1" gaging and guiding means for sustainingu the edge and, lateralthrustsof the'sheets while passing through ,the feed rolls and for maintaining said sheets against edge wise movement and to travel in a between said feedrolls. v, f g

15. Sheet; feeding rolls dn combination with a bending roll shaft, a'bending-roll carried. theneby, spring-held adjustable straight line boxes carrying said shaft, and-.manually- 1' controlled means for. adjusting said boxes to bodily carry said shaft laterally to ad-:

just said bending roll to and from sheet curving position with respect to said feedshaft, and push rods engaging said cams and moved thereby and engaging said boxes and determining the positions thereof.

16. In a machine for producing either curved or straight shaped sheets, alaterally adjustable'rotary sheet bending roll, a manually operated rotary roll-adjusting shaft, means operativelyconnecting said shaft and said roll for moving and determining the lateral position of said roll, an index disk on and rotating with said shaft and having a stop pin adjustable therearound, and an in- I deX step projecting intothe path of said pin to stop said shaft when rotated in either direction at any predetermined point withina complete revolution.

17. In a machine for producing either curved or straight shaped sheets, a laterally adjustable rotary sheet bending roll, a rotary roll-adjusting shaft provided with means for manually rotating the same, means whereby said roll will be moved throughout its full range of lateral adjustment on a complete revolution of said shaft and whereby said roll will be held for operation at any point within its said range of adjustment, an index disk rotating with said shaft and having a stop adjustable thereon to any roll indicating position thereof within, its circle of rotation, and a fixed index stop to engage said adjustable stop and stop rotation of the disk and shaft when 1 the roll has reached its desired position.

18. Rotary cooperating sheet feeding and bending rolls, in combination with means to effect relative adjustment of said rolls for the production of straight sheets or curved sheets comprising a rotary shaft, manually operated means for rotating said shaft, a rotary cam on said shaft determining said adjustment, an index disk on said shaft and rotating with said cam and corresponding thereto and having an adjust-able stop, and a fixed stop projecting into the path of movement of said adjustable stop.

19. Cooperating sheet feeding, shaping and bending rolls embodying means abutting longitudinal edges of the sheets to re-' ceive edgewise thrust of the sheets in com binat-ion with parallel driving shafts for and on which said rolls are freely movable longitudinally, and ireans coupling said rolls together to render them movable longitudinally of said shafts as a gang.

20. Cooperating rotary sheet shaping rolls providing circumferential recesses to receive the previously shaped enlarged, opposite longitudinal edge portions of the sheet, in combination with a pair of idler rolls in advance of saidpreviously mentinned rolls and guiding the sheet thereto, one of said idler rolls receiving a longitugularly arranged sheet edge engaging and lateral thrust sustaining idler wheel in advance of said rolls to lie beside the path of the sheet to said feeding rolls and to engage the enlarged lower edge of the sheet resting on said horizontal wheel.

22. Cooperating rotary sheet feeding and shaping rolls formed with a sheet edge engaging portion receiving the edgewise thrust of the sheets passing between the rolls and means yieldingly supporting said rolls and rendering them freely movable longitudinally together as a gang, in combination with sheet guiding means holding the same against edgewise movement in either direction. 23. Cooperating rotary positively driven sheet feeding rolls having opposite circumferentialdepressions to receive a previously formed enlarged longitudinal sheet edge without distorting the same, in combination with guiding means in advance of said rolls to engage said enlarged sheet edge and consisting of a transversely arranged grooved idler wheel between the ends of said rolls and receiving said enlarged sheet edge, and

anangularly arranged grooved idler wheel arranged at one side of the path of the sheet and engaging said enlarged edge to hold the same against movement from said' transversely arranged idler wheel.

2st. Coiiperating rotary positively driven sheet feeding and shaping rolls formed to receive opposite portions of a sheet previously formed with a longitudinally folded edge and with an opposite tubular longitudinal edge, said rolls being formed to provide recesses to receive said edges without distorting the same, one of said rolls having an annular projecting flange 36, to overhang one longitudinal edge of said sheet and receive the edgewisrthrust thereof in one direction, and a transversely-arranged idler Wheel receiving the opposite longitudinal edge of said sheet to receive the edgewise thrust of said sheet in the other direction.

25. Opposite pairs bf cooperating rotary of said rolls being freely movable longitudinally and together toward the opposite pair and provided with adjusting means comprising a yielding support in combination with sheet bending means arranged in rear of said rolls and adjustable transversely of the line of feed of the sheet from the rolls and into engagement with said sheet to curve the same laterally.

26. Cotiperating positively driven rotary sheet corrugating rolls freely movable longitudinally and yieldingly held againstsuch longitudinal movement and formed to longitudinally corrugate a sheet having a folded over longitudinal edge, said rolls being circumferentially recessed to form a space receiving said edge without distorting the same, one roll having a project-ing circumferential flange overhanging said space to receive the ed'gewise thrust of said edge without distorting the same.

27. Two gangs of coiiperating positively driven rotary sheet feeding and shaping rolls, and means whereby said gangs are adjustable toward and from each other to receive sheets of different widths comprising a yielding support for one of said gangs rendering the same freely movable longitudinally, said gangs simultaneously and longitudinally acting on opposite portions of the sheet fed therethrough.

28. Two gangs of C06 crating positively driven rotary sheet feeding and shaping rolls, and means whereby said gangs are ad- 'justable toward and from each other to receive sheets of different widths, said gangs simultaneously and longitudinally acting on opposite portions of the sheet fed there-- through, in combination/with rotary positively-driven sheet bending rolls arranged in rear of said feeding rolls and cooperating therewith to curve the sheets laterally as they issue from said feeding rolls, said bending rollsbeing included in said gangs, respectively, means rendering one of said gangs freely movable longitudinally in following the edge of the sheet and means for adjusting said bending rolls laterally and transversely of the direction of feed of said sheets. l

'29. In combination, elongated parallel positively driven rotary feed roll shafts, an elongated rotary positively driven bending roll shaft arranged in rear of and parallel with said first mentioned shafts, means for adjusting said bending roll shaft bodily and laterally independently of said first mentioned shafts, cooperating sheet feeding and bending rolls carried by corresponding ends of said shafts, another'set of cotiperating sheet feeding and bending rolls arranged at opposite corresponding portions of said shafts, one set of said rolls being adjustable longitudinally of said shafts, and means reoeiving said adjustable set of rolls for moving them longitudinally together as a gang and provided with manually operated means for adjusting the same and maintaining the rolls in the desired adjustment.

30. A pair of parallel rotary positively.

and bending rolls fixed to and arranged at corresponding ends of said shafts, another Q gang of cooperating rotary sheet feeding and bending rolls driven by and arranged at corresponding opposite portions of said shafts and adjustable longitudinally thereof, means for adjusting said last mentioned gang, and a longitudinally arranged sheet guiding idler roll parallel with and arranged in advanced one of said feed -roll' shafts and mounted independently thereof and of the rolls thereon to receive the lateral thrust of the sheet while being bent laterally by said bending rolls.

31. Parallel rotary shafts, means for simultaneously and positively rotating the same, a gang of cooperating rotary sheet feeding and bending rolls arranged on and rotated by said shafts and longitudinally adjustable thereof, a frame adjustable longitudinally of said shafts, said rolls rotating independently of said frame and coupled thereto to move longitudinally therewith, and a screw and adjusting means for adjusting said frame and maintaining the same in the desired adjustment.-

32. Two gangs of simultaneously, constantly, uniformly and positively driven cooperating rotary sheet feeding and bending rolls arranged to receive the opposite edge portions of straight sheets and feed the same forwardly and longitudinally and shape said edge portions of said sheetsand then bend said sheets laterally to curve the same to the desired radius, in combination with manually-operated yieldingly-supported means whereby one gang of said rolls is adjustable toward and from the other to lio rolls spaced apart to receive and simultane-v ously and longitudinally shape the opposite edge portions of a sheet fed forward by said sets of rolls, sheet bonding means behind both setsof rolls to cooperate therewith in maria! operative bending position and to various bending positions to produce straight shaped sheets or shaped sheets of various degrees of curvature, means in advance of said feeding rolls to sustain the lateral thrust of said sheets while being bent, actuating connections for said various rolls for constantly rotating the same independently of and .during said adjustment of said bending means, and adjusting means whereby said sets of rolls and bending means can be adjusted to receive and operate onfsheets of different widths. .o

34. In combinatiomopposite sets of. alined, cooperating, positively driven, rotary sheet shaping and bending rolls, means whereby the distance between said two sets of rolls can be varied to receive sheets of different widths, and means whereby a setof said rolls can automatically move axially in following the uneven edges of sheets being acted on by the "rolls;

A pair of cooperating rotary sheet feeding rolls, another pair of cooperating rotary sheet shaping rolls in axial alinement with said first mentioned pair of rolls and rotating in unison therewith, said pairs of rolls arranged to receive opposite edge portions of a sheet and to feed the same for ward and longitudinally act on the edge portions along lines parallel with the adjacent edges thereof, in combination wit-h adjust-ing means whereby the distance between said pairs of rolls can be varied to accommodate sheets of different widths, one pair of said rolls being yieldinglyheld in longitudinal adjustment to permit automatic axial yielding thereof in following uneven sheet edges.

36. In combination, a pair of parallel rotary driven shafts, a pair of cooperating rotary rolls fixed thereon and having their working faces formed to receive a longitudinal portion of a sheet, another pair of cooperating rotary rolls rotating with and longitudinally adjustable on said shafts and having their working faces formed to shape a longitudinal port-ion of said sheet opposite the portion shaped by said first mentioned rolls, means for longitudinally adjusting said second pair of rolls comprising an adjusting s crew freely movable longitudinally with said rolls and provided with an adjusting nut, and a spring abutment for said nut, substantially as described.

37. A lower set of positively and continuously driven rotary vertical rolls comprising a pair of sheet feeding rolls and asheetbending roll in rear thereof, a vertically adj ustableupper set of positively and continuously driven rotary vertical rolls comprising a pair of sheet feeding and shaping rolls alined and rotating with the corresponding rolls of the lower set and a rear sheet bending roll alined androtating Withthe lower bending roll, means for supporting, driving and adjusting said rolls, a front vertical idler and lateral thrust sustaining roll, and

thrust sustaining means in advance of the lower set of rolls and adapted to engage the lower edge of a vertically disposed sheet passing to and betweenthe upper and lower sets of rolls.

38. Opposite sets of alined rotary positively driven rctarycooperating sheet feeding rollshaving their working faces formed to simultaneously and longitudinally re? ceive opposite longitudinal edge portions of a sheet fed forward and between said rolls of each set, the rolls of one of said sets being yieldingly supported and correspondingly formed at their working faces to longitudinally form one edge portion of the sheet With a curved lateral bendand one of said rolls having an annular projecting portion to overhang said edge of the sheet, in come bination with supporting and actuating means for said rolls.

39. In combination, an upright frame having upper and lower horizontally-disposed housings, a drive shaft, a pair of parallel vertical rotary shafts, boxes therefor arranged in said housings, gearing for posiconnecting the same with said drive shaft, a rear vertical rotary shaft, boxestherefor adjustably arranged in said housings, expansion gearing constantly driving said rear shaft from one of said first mentioned shafts whatever the position thereof within its range of adjustment, a rotary vertical adjusting shaft carried by said frame, operative connections between the same and the boxes of said rear shaft for adjustingsaid boxes and rear shaft, a pair of cooperating .she'et'receiving rolls above the lower housing and fixed on the lower port-ions of said pair of shafts, a sheet bending roll behind shaft, a pair of upper cooperating sheet re ceiving rolls below the upper. housing and rotated by and longitudinally adjustable on said pair of shafts, an upper sheet bending roll behind said upper shaping rolls and rotated by and longitudinally adjustable on said rear shaft, a yoke in which said three upper rolls are rotatable and in which said bending roll is laterally adjustable and by which said three rolls are, as a set, vertically yoke vertically. v

40. In combination, cooperating positivelydriven rotary sheet-feeding and shaping rolls, means for guiding sheets thereto and receiving the lateral and edgewise thrust thereof-and maintaining the sheets against edgewise movement between said rolls and front sheet upholding, guiding and lateral adjustable, and means for adjusting said -tively driving hoth shafts and operatively said shaping roll and fixed on said rear to travel in a straight line to and between said rolls, a rotary sheet bending roll geared to and positively driven with said feeding and shaping rolls, and manually controlled means for moving said bending roll during the passage of the sheets between said rolls 'into various sheet curving positions with respect to said rolls to laterally engage the shaped sheets issuing from said rolls.

{H.In combination, a pair of parallel rotary shafts positively driven and geared together, a pair of rotary sheet feeding and shaping rolls fixed thereto, another pair of feeding rolls driven by saidshafts and freely adjustable longitudinally thereof, a

rotary bending-roll shaft arranged in rear of-and parallel with said first mentioned shafts, a bending roll fixed thereto, another bending roll driven by and freely adjustable longitudinally of said shaft, means for moving said. adjustable feeding and bending 'rolls together longitudinally of their re spective shafts, manually controlled means for shifting said bending roll shaft tocarry said bending rolls to and from various operative sheet curving positions with respect to said feeding and shaping rolls, and expansion gearing establishing constant operative driving connections between said bending roll shaft andone of said feeding and shaping roll shafts.

-rolls freely movable longitudinally of said shafts, 'a bending roll shaft provided with a bending roll fixed thereto and a bending roll behind said adjustable feeding rolls and freely adjustable therewith longitudinally of its shaft, manually controlled means for bodily shifting the position of said bending roll shaft to carry its rolls to and from operative sheet curving position with respect to said feeding and shaping rolls, and expansion gearing between one of said shaping and feeding roll shafts and said bending roll shaft and located between said fixed and said adjustable rolls comprising swingable links loosely mounted on said shafts and pivotally joined at their free ends by a trans- Verse pivot, an intermediate idler gear carried by said links and mounted on said pivot and gears in mesh with said intermediate gear and fixed on said shafts, respectively.

In testimony whereof we afi'x our s'ignatures in presence of two witnesses.

JOHN F. HOAG.

Witnesses:

' R. H. YALE,

V. O. RANKIN.

Copies ct this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

WILLIAM THOMAS. p 

